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AN1872 PDF预览

AN1872

更新时间: 2022-11-29 07:20:47
品牌 Logo 应用领域
美信 - MAXIM 电池
页数 文件大小 规格书
2页 208K
描述
Low-Battery Indicator Has Low Cost and High Efficiency

AN1872 数据手册

 浏览型号AN1872的Datasheet PDF文件第2页 
AMPLIFIER AND COMPARATOR CIRCUITS  
Application Note 1872: Feb 03, 2003  
Low-Battery Indicator Has Low Cost and High Efficiency  
The circuit described uses a low-power CMOS comparator to provide an LED visual  
indication of a low-battery condition, without excessive battery current drain. This is  
achieved by pulsing the LED at a low frequency and low duty cycle and conserving  
battery current in the OFF cycle by placing the comparator in shutdown. Equations and  
circuit analysis are included for determining duty cycle and comparator trip points.  
The usual method for implementing the low-battery warning featured in most battery-operated  
equipment is to illuminate an LED. By drawing current, however, the LED exacerbates the  
low-battery condition. You can greatly reduce the LED's power consumption by operating it at  
a low frequency and a low duty cycle.  
An existing low-battery output (LBO) like that found on DC-DC converters offers a convenient  
way to light the LED (Figure 1). IC1 is a small, inexpensive comparator with shutdown  
capability in a 6-pin SC70 package. It remains in shutdown while the battery voltage is at  
normal operating levels, but asserts LBO when battery voltage falls below a preset threshold.  
Figure 1. Operating this low-battery-warning LED at low frequency and low duty cycle  
saves power and extends battery life.  
www.maxim-ic.com/an1872  
Page 1 of 2  

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